I've only used the Neat plug-in AND in PP2. I find it to work pretty well, especially if one has enough "blank" area to sample properly, and then things to not change too much. In PP2, it's a tad slow to Render, but not that bad. If I were shooting with its use in mind, I'd also capture a grey-card (or maybe a blank wall in the scene) at the head of each major lighting change. Unfortunately, one often does not KNOW that they might have to use it.

But since i work with HD i have noticed several time problem. My problem comes when i downscaling my HD footage to SD with after effects. When i try to apply remove grain filter on my new SD footage (downscale HD with After fx) nothing change. i tried several codec (.avi, .m2v even images sequences) for my downscaling without have change when i apply remove grain filter. When i apply remove grain filter on one image (still picture) of my sequence image i exported that run ! Could someone explain me what the problem ?

We can notice in CS4 that filter "remove grain" disapears in Adobe media encoder. Now the only one filter is gaussian blur.... bad new.